KR950007430A - Adaptive Ghost Removal Device and Method - Google Patents

Adaptive Ghost Removal Device and Method Download PDF

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KR950007430A
KR950007430A KR1019930017201A KR930017201A KR950007430A KR 950007430 A KR950007430 A KR 950007430A KR 1019930017201 A KR1019930017201 A KR 1019930017201A KR 930017201 A KR930017201 A KR 930017201A KR 950007430 A KR950007430 A KR 950007430A
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filtering
ghost
center tap
shock response
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KR960016564B1 (en
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박성륭
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배순훈
대우전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

본 적응적인 고스트제거장치 및 방법은 수신되는 신호에 실려 있는 고스트중 선고스트의 크기 및 위치와 파형등화의 필요성의 정도에 따라 FIR필터의 센터탭의 위치를 적응적으로 조절하여 고스트를 제거하기 위한 것이다. 이를 위하여 인가되는 신호에 대하여 선형 위상필터링을 하여 수신되는 신호에 대하여 선고스트 제거 및 파형등화를 하는 유한충격응답필터링시 센터탭의 위치를 채널 특성화처리 결과신호에 의하여 자동조절되도록 제어하도록 구성된다.This adaptive ghost elimination device and method is adapted to remove ghosts by adaptively adjusting the position of the center tap of the FIR filter according to the magnitude and position of the ghosts in the received signal and the degree of necessity of waveform equalization. will be. To this end, the position of the center tap is controlled to be automatically adjusted by the channel characterization result signal during the finite shock response filtering that performs linear phase filtering on the applied signal and performs line ghost removal and waveform equalization on the received signal.

따라서 유한충격응답필터링에 의한 고스트제거를 좀더 효율적으로 수행할 수 있다.Therefore, ghost elimination by finite impact response filtering can be performed more efficiently.

Description

적응적인 고스트제거장치 및 방법Adaptive Ghost Removal Device and Method

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 따른 적응적인 고스트제거장치도이다,1 is an adaptive ghost removal apparatus according to the present invention,

제2A,B,C도는 채널특성화 결과에 따른 FIR(Finite Impulse Response) 필터의 센터탭(Center Tap)의 위치를 나타낸 것이다.2A, B and C show the positions of the center taps of the finite impulse response (FIR) filter according to the channel characterization result.

Claims (3)

수신되는 직접파신호와 함께 인가되는 반사파신호에 의하여 발생되는 고스트를 제거하기 위한 고화질 영상 신호처리시스템의 고스트 제거장치에 있어서; 인가되는 신호에 대하여 선형 위상필터링을 하여 수신되는 신호에 대하여 선고스트 제거 및 파형등화를 하는 유한충격응답 필터링을 하기 위한 제1필터링수단(10); 고스트에 대한 채널특성화처리 결과신호에 의하여 상기 제1필터링수단(10)의 센터탭의 위치를 자동 조절하기 위한 제어수단(30); 상기 제1필터링수단(10)에서 출력되는 신호를 소정 전달함수에 의하여 필터링하고, 피드백하여 현재 입력되는 값과 선형결합되도록하여 수신되는 신호에 대하여 롱고스트를 제거하는 무한충결필터링을 하기 위한 제2필터링수단(20)을 포함함을 특징으로 하는 적응적인 고스트제거장치.A ghost removing apparatus of a high quality image signal processing system for removing ghost generated by a reflected wave signal applied together with a received direct wave signal; First filtering means (10) for performing linear phase filtering on the applied signal and performing finite shock response filtering for pre-ghost elimination and waveform equalization on the received signal; Control means (30) for automatically adjusting the position of the center tap of the first filtering means (10) according to the channel characterization result signal for the ghost; A second filter for filtering the signal output from the first filtering means 10 by a predetermined transfer function, and performing feedback coupling to linearly combine with the current input value to remove long ghosts for the received signal; Adaptive ghost removal device characterized in that it comprises a filtering means (20). 제1항에 있어서, 상기 제어수단(30)은 상기 채널특성화처리 결과신호에 의하여 파형등화가 필요없는 경우에는 상기 제1필터링수단(10)의 센터탭이 앞부분에 할당되도록 제어신호를 출력하고, 상기 결과신호에 의하여 선고스트가 발생된 경우에는 상기 센터탭을 선고스트가 발생된 위치에 근접하도록 할당하는 제어신호를 출력하고, 상기 결과신호에 의하여 파형등화가 필요한 경우에는 상기 센터탭이 중앙에 할당되도록 제어신호를 출력함을 특징으로 하는 적응적인 고스트제장치.The method of claim 1, wherein the control means (30) outputs a control signal so that the center tap of the first filtering means (10) is assigned to the front part when the waveform equalization is not necessary due to the channel characterization result signal. When the ghost is generated by the result signal, a control signal for allocating the center tap to the position where the ghost is generated is output. When the waveform equalization is required by the result signal, the center tap is located at the center. Adaptive ghost agent, characterized in that for outputting a control signal to be assigned. 수신되는 직접파신호와 함께 인가되는 반사파신호에 의하여 발생되는 고스트를 제거하기 위하여 우선 인가되는 신호를 선형위상특성에 의하여 유한충격응답필터링하는 유한충격응답필터링과정, 유한충격 응답필터링과정에 의하여 출력되는 신호를 현재 입력되는 값과 전에 입력된 값이 선형결합되도록 무한충격응답필터링하는 무한충격응답 필터링과정으로 이루어지는 고스트제거방법에 있어서; 수신되는 신호에 대하여 왜곡의 정도를 파악하기 위하여 채널 특성화 처리를 수행하는 채널특성화과정; 상기 채널특성화과정 결과, 파형등화가 필요없는 경우에는 고스트제거를 위한 상기 유한충격응답필터링시 센터탭을 앞부분에 할당하도록 제어하기 위한 제1센터탭제어과정; 상기 채널특성화과정 결과, 선고스트가 존재하는 경우에는 상기 유한충결필터링시 상기 센터탭을 선고스트가 발생된 부분에 할당하도록 제어하기 위한 제2센터탭 제어과정; 상기 채널특성화과정결과, 파형등화가 필요한 경우에는 상기 유한충격응답필터링시 상기 센터탭을 중앙에 할당하도록 제어하기 위한 제3센터탭제어과정을 포함함을 특징으로 하는 적응적인 고스트제거방법.In order to remove the ghost generated by the reflected wave signal applied together with the received direct wave signal, first, the finite shock response filtering process for filtering the applied signal by the linear phase characteristic, and the finite shock response filtering process A ghost elimination method comprising an infinite shock response filtering process for infinitely impact response filtering so that a signal currently input and a previously input value are linearly coupled to a signal; A channel characterization process for performing a channel characterization process on the received signal to determine a degree of distortion; A first center tap control process for controlling to assign a center tap to a front part when the finite shock response filtering for ghost removal is performed when the waveform characterization is not necessary; A second center tap control process for controlling to allocate the center tap to a portion where the sun ghost is generated during the finite charge filtering when the channel ghosting is present as a result of the channel characterization process; And a third center tap control process for controlling the center tap to be allocated to the center when the finite shock response filtering is required when the waveform equalization is necessary as a result of the channel characterization process. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930017201A 1993-08-31 1993-08-31 Adaptive ghost cancelling apparatus Expired - Lifetime KR960016564B1 (en)

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KR960016564B1 KR960016564B1 (en) 1996-12-14

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100781250B1 (en) * 2001-02-09 2007-12-03 엘지전자 주식회사 Channel equalizer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100781250B1 (en) * 2001-02-09 2007-12-03 엘지전자 주식회사 Channel equalizer

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